First channel crossing is always exciting, especially when all you can see for 360 degrees is water. In order to make the crossing a non-event/boring preparation is key. When I did mine I spent hours on the boat checking nuts, fuel lines, levels etc etc until I could find nothing to do.
Make sure you have spares for everything possible and the tools to make the change.
I assume you'll be in company in which case all work off the same nav points and stay in reasonable distance of each other. Agree to pair up or travel in a group and agree the cruising speed. In a cruise it's important to know what the other boats happy cruising speed is as there's nothing worse than seeing your buddy boat disappear off the horizon at 50 knots where you can only do 25.
Even if it's cloudy make sure you have sun protection on as I've done a few crossings in cloud only to arrive looking like a lobster. Keep a few chocolate bars in your pockets and water to hand.
Make sure your crew are keeping an eye on engine gauges and navigation as many eyes will spot problems. Everyone should be looking at the sea ahead of you for nets / bits of wood / trees and make sure they tell you. I've had a few close calls when my crew "assumed I'd seen something".
Take a camera and beer money. There's nothing like the first beer when you arrive in port.